參數資料
型號: HD404369S
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer
中文描述: 4位HMCS400系列微機
文件頁數: 53/115頁
文件大?。?/td> 452K
代理商: HD404369S
HD404369 Series
53
Prescalers
The MCU has the following two prescalers, S and W.
The prescaler operating conditions are listed in table 24, and the prescaler output supply is shown in figure
35. The timer A–C input clocks except external events and the serial transmit clock except the external
clock are selected from the prescaler outputs, depending on corresponding mode registers.
Prescaler Operation
Prescaler S:
11-bit counter that inputs the system clock signal. After being reset to $000 by MCU reset,
prescaler S divides the system clock. Prescaler S keeps counting, except in watch and subactive modes and
at MCU reset.
Prescaler W:
Five-bit counter that inputs the X1 input clock signal (32-kHz crystal oscillation) divided by
eight. After being reset to $00 by MCU reset, prescaler W divides the input clock. Prescaler W can be reset
by software.
Table 24
Prescaler Operating Conditions
Prescaler
Input Clock
Reset Conditions
Stop Conditions
Prescaler S
System clock
(in active and standby
mode), subsystem clock
(in subactive mode)
MCU reset
MCU reset, stop mode,
watch mode
Prescaler W
32-kHz crystal oscillation
MCU reset, software
MCU reset, stop mode
Subsystem
clock
Prescaler W
Timer A
Timer B
Timer C
Serial
Alarm output
circuit
System
clock
Prescaler S
Clock
selector
f
X
/8
f
X
/4 or f
X
/8
Figure 35 Prescaler Output Supply
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